title: Patient-specific flow analysis of brain aneurysms at a single location: comparison of hemodynamic characteristics in small aneurysms.
abstract: The purpose of this study is to examine and compare the hemodynamic characteristics of small aneurysms at the same anatomical location. Six internal carotid artery-ophthalmic artery aneurysms smaller than 10 mm were selected. Image-based computational fluid dynamics (CFD) techniques were used to simulate aneurysm hemodynamics. Flow velocity and wall shear stress (WSS) were also quantitatively compared, both in absolute value and relative value using the parent artery as a baseline. We found that flow properties were similar in ruptured and unruptured small aneurysms. However, the WSS was lower at the aneurysm site in unruptured aneurysms and higher in ruptured aneurysms (P < 0.05). Hemodynamic analyses at a single location with similar size enabled us to directly compare the hemodynamics and clinical presentation of brain aneurysms. The results suggest that the WSS in an aneurysm sac can be an important hemodynamic parameter related to the mechanism of brain aneurysm growth and rupture.
authors.affiliation: Division of Interventional Neuroradiology, David Geffen School of Medicine, University of California, 10833 LeConte Ave., Box 951721, Los Angeles, CA 90095, USA. achien@mednet.ucla.edu
authors.forename: Aichi
authors.initials: A
authors.lastname: Chien
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tateshima
authors.forename: Marcelo
authors.initials: M
authors.lastname: Castro
authors.forename: James
authors.initials: J
authors.lastname: Sayre
authors.forename: Juan
authors.initials: J
authors.lastname: Cebral
authors.forename: Fernando
authors.initials: F
authors.lastname: Viñuela
mesh_terms: D017542:Aneurysm, Ruptured / Q000000981:diagnostic imaging / Q000503:physiopathology; D002340:Carotid Artery Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology; D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging / Q000503:physiopathology; D018056:Hemorheology; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000503:physiopathology*; D009880:Ophthalmic Artery / Q000000981:diagnostic imaging / Q000503:physiopathology; D011859:Radiography; D013314:Stress, Mechanical